Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Door stopped travel about 2/3 down, motor continued running but chain stopped moving?

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Remove the cover and check your drive gear. It is a white nylon gear just in front of the motor. It will be obvious if it is stripped. The part number if 41A2817 and is available at any good door opener service company. It comes with instructions.

Posted on Feb 07, 2010

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The motor runs but the chain does not move, we just had it worked on 1 month ago and now this, please help


IF THE MOTOR IS JAMMED (JUST HUMS) LOOSEN THE CHAIN AND ADJUST THE LIMITS AND TIGHTEN CHAIN.

IF THE MOTOR ACTUALLY RUNS AND THE CHAIN DOES NOT MOVE THE DRIVE GEARS NEED TO BE REPLACED. THEY SELL A KIT THAT INCLUDES THE BUSHINGS AND SHAFT. DO NOT BUY THE SMALLER KIT AND DO NOT REPLACE ONLY ONE GEAR (THE OLDER WORN GEAR WILL CHEW UP THE NEW GEAR) THIS MAY BE WHAT YOU HAD DONE - IF SO CALL THE SERVICE GUY THAT DID THE POOR REPAIR AND HE SHOULD REPLACE BOTH GEARS UNDER HIS SERVICE WARRANTY. ANYONE WORKING ON THESE SHOULD KNOW BETTER.

GOOD LUCK.

STEVE

Dec 14, 2014 | Sears Craftsman 13953754 Wireless Garage...

1 Answer

Garage Door Opener Will Open But Not Close


Your machine is jammed, meaning the carriage part or trolley that has the swingarm attached to the door has went further then it,s limit! your trolley that has the chain or belt connected to it may be jammed against the stop bolt that is just before the powerhead of your opener. In order to get it to operate again you must loosen the chain and take some tension off of it , you should also remove the stop bolt at this point sine a loose chain can add an extra inch or two to the travel limit when the door is coming up or going down . Once the bolt is removed your garage door opener should work again , be shure to retighten the chain after removing the stop bolt and check your travel limits in the up and down position! Hope this helps you in getting it to work again! Glenn

May 28, 2014 | liftmaster Garage Door 1/2 Hp

1 Answer

It will only travel down a short distance then reverse


With the door in the open position loosen the chain enough so that you can remove it from the sprocket above the motor. Now run the motor until the sprocket has turned counterclockwise and stopped. With the door still open and everything attached replace the chain on the sprocket and tighten. Do not overtighten. This will get everything back into sync and some adjustments of the up and down limits may be necessary. Be sure to set that down pressure control back where it was as it affects the safety of the opener.

Sep 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2HP Door Opener won't stay closed


Loosen the chain and run the opener until the sprocket runs in the counter clockwise direction and stops. Now with the door in the open position replace the chain. This will get everything back into sync but I hope you remembered where all those controls were. You need to put them back in their original positions.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Motor runs but gear doesn't turn on my Craftsman 1/2 HP


What did you pay for near gears. curious. often get stripped gears in cold weather as door is frozen down to ground. if possible, kick door bottom edge with heel to break bound if you suspect it is frozen to ground.

Jan 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftsman 3/4


Open up the caseand look at the travel assy. Sometimes the limit (up or down) do fall off the assy. Just snap it back on.

Jan 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Chamberlain Power Drive 1/2 HP - motor runs but does not move chain


I have the same problem. I just removed the cover and discovered a nylon gear had been worn out. I found lots of shavings inside the cover. The nylon gear is beneath the exterior chain gear. I am looking for information on how to replace it, if I can find the part. If you decide to look at yours, unplug the power and remove the sheet metal screws securing the bottom portion of the cener cover to the front and back covers. Then just remove the upper screws from the center cover. Good luck.

Oct 08, 2008 | Chamberlain Powerdrive PD422D 1/2 HP...

1 Answer

Opener will not reverse


FIRST YOU NEED TO RESET THE CHAIN .

Unplug power
Release the door from the opener close the door manually. take the chain loose and slide the traveler down to reengage with the trolley. Plug in power, run the unit with chain off untill it completes a clockwise cycle and stops. reconnect the chain and set tension.

Adjust the chain tension.

If it still moves 6-8 inches and flashes 5 times. the problem is in the rpm sensor.

Full diagnostics are in the owners manual - FREE at
http://help.chamberlain.com/help/en-us/InstructionManuals

Oct 06, 2008 | Sears Craftsman LiftMaster Chamberlain...

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